David a



Dg A. SMITH.

Whietree. No. 17,752, 'Patented Ju1y 7. 1857A i All N-PF'ERS. PMow-umoaRAPHER. wAsmNaroN. u c.

UNITED STATES PATENT OFFICE.

DAVID A. SMITH, OF IVASHINGTON, DISTRICT OF COLUMBIA.

WI-IIFFLETR-EE.

Specification of Letters Patent No. 17,752, dated July 7, 1857'.

To all whom it may concern:

Be it known that I, DAVID A. SMITH, of the cityA of Washington, District of Columbia, have invented certain new and useful Iin` rovements in Wbiflietrees and I do hereby declare that the following is a full, clear, and exact description of the same, reference vbeing had to the accompanying drawings and to the letters of vreference marked thereon.

The nature of my invention consists in an improved mode of attaching and detaching traces for WhiHietrees.

In order that thoseskilled in the arts may manufacture and use my invention I will proceed to describe its construction and operation.

In the accompanying drawings which form a part of this specification Figure 1 is a plan view. Fig. 2 is a side elevation.

In Fig. 1 A is the whiffletree. B are spring rods, p are pins in the Whifletree, C is a pivot, o is a sliding late into which pivot C enters. D are slotte caps on the ends of the whiffletree.

In Fig. 2 A is the whiffletree, B B1 the s ring rods, C pivot entering sliding plate o, (i) is a lever attached to spring rods B and sliding plate o by ivots as seen. p are pins in the Whiflletree, are slotted caps forming the ends of the whiietree, x x1 are notches in the spring bars B, B1. F is a plate extending to the sides and vseveral inches with the length of the whiietree. E slots in caps D.

In the operation of this invention one trace may be put into slot E as seen in Fig. 2, then by means of lever G which is raised as seen rod B is ushed through the aperture in the end o the trace and it'is secured; the

A reverse motion of levelVH to the sliding plate by means of the pvot C;

this pivot C acts as a fulcrum when the lever G is being elevated to a perpendicular, but after it crosses the perpendicular line the pivot which attaches B to lever G becomes the fulcrum, as one end of rod B stands firmly against one side of the slotted cap D. When lever G stands in the position seen in Fig. 2 and it is desired to draw in bar B and detach the trace the notch x1 catches on the pin p and thus changes the fulcrum to the end of lever G which enables me to draw in the bar B with great ease.

It will be seen that only one of the traces can be fastened at a time so that it can be operated by one person Without any difliculty.

I-Iaving thus fully described the nature of my invention, what I claim as new and desire to secure by Letters Patent is- The lever G attached to a movable fulcrurn on plate 0, and sliding in slotted plate F, for operating the spring bars B and B1 alternately, as described, and for the purpose set forth.

DAVID A. SMITH.

Witnesses:

JOHN S. HoLLrNesHEAD, F. G. CLAYTON. 

